Limited Angle Torque Motors/Tachometers

Performance Considerations

Most toothed motors have large copper areas available and large air gap flux densities to achieve a high torque to power ratio. The limited angle torque motor, in order to achieve the zero cog and flat torque vs angle advantages, must necessarily have a large magnet air gap into which the windings can be set. This drops the available gap flux density and hence the limited angle cog free motors tend to be physically a bit larger than their toothed counterparts.

The motors have typically low drag torque (hysteresis of the lamination steel) and low inductance which keeps the electrical time constant low so that the motor will respond rapidly to move requirements. The motors are highly linear (torque/current) from zero through continuous to peak torque levels. The motors run very quietly and smoothly, particularly at slow speeds where high accuracy of positioning is required.

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